Paper and process of coating the same



Patented Jan. 18, 1927.-

UNITED STATES 1,614,611 PATENT OFFICE.

GERHARDT n. GRIMM, or SPRINGFIELD, MAssAcHuSnTTS, ASSIGNOR To WESTFIELD RrvnR PAPER COMPANY, or RUSSELL, MASSACHUSETTS, A conrona'rron or Tus- SAGHUSETTS.

Ho Drawing.

Such paper heretofore has been prepared either by coating a suitable web with a size.

or varnish, and dusting with the metallic powder, or by coating the paper with an emulsion of the metal. The latter practice is not satisfactory, since it is impracticable to .so coat the water proofcd or grease proofed paper in ordinary coating machines. The product of the former practice isnot suitable for use with comestibles, or any commodity having a flavor and aroma of its own, such as tobacco products and the like,

since the odor of the size or varnish persists after most thorough drying.

The product in the former practice is prone to lack of uniformity in the distribution of the powder, and this may be due to defective work in either stage. The size or varnish may be unequally distributed, in which case there will be a corresponding lack of uniformity in distribution of the powder or the fault may due to the unequal spreading of the powder.

In the former instance, the powder lies upon the surface of the varnish, or is but 40 slightly embedded therein, so that the raw surface of the powder is outward. Thus the paper is harsh and unpleasant to the touch lacking the'smooth finish desirable in such paper. Moreover the superficial dust particles are easily dislodged when the paper is handled. Such paper is not well adapted for embossing, an'- operation which is desirable in the most highly finished paper.

In coating with an emulsion of the powder, it is desirable that the paper be water and grease proofed and coated at a single operation, and the vehicles heretofore used.

for the powder have not been of a character to thoroughly -'.accomplish this purpose,

PAPER AND PROCESS OF COATING THE SAME.

Application filed January 14, 1925. Serial No. 2,441.

while at the same time presentin a paper surface satisfactory from all stan points. One ofthe objects of the present invention 1s the provision of a paper, and a method of coating the same with metallic dust of any selected kind in a single operation.

Another object is to provide a vehicle for the metal dust, which notonly securely fixes theparticles to the paper, but simultaneously moisture and grease roofs the same.

Another object is t 1e provision of a paper uni formly coated, presenting a coating pleaslng to the sense of both sight and touch, and inofi'ensire to the sense of smell.

Another object is theprovision of a paper wherein the coating is soft and flexible and the paper is capable of being deeply embossed without marring the coating.

. lVith these and other objects in view the invention consists in the article, and in the process of making the same as defined in the claims appended hereto; it being understood that various changes may be made in the character and the proportions of the ingredients, within the scope of the claims.

The preferred vehicle for the metallic powder, whether applied in emulsion or by powdering includes a fixative and water proofing agent, a softening agent and a solvent; The vehicle which fixes the powder to the paper whether mixed prior to the time of application or at such time, is a solution of bleached shellac and borax (sodium borate) in water,with an admixture of a waxy material, the amount depending upon the quality of paper desired.

In preparing the vehicle 6 to 8 ounces 0 borax is dissolved in a gallon of water, by bringing the water to a boil after or during the addition of the borax. The shellac 1% to 2 pounds is then stirred into the water, which is afterwards permitted to cool.

Either beeswax or parafiin wax may be used. The former may be dissolved in pearlash, and the latter is preferably used with stearic acid and japan wax, in about equal proportion. The wax is dissolved in borax water, enough beingnsed to saponify the wax, and'to bring to a creamy consistency, very nearly resembling cold cream, the proportions of each being regulated by the results dwired. 7 The vehicle prepared as above described, is mixed with the metallic powder in about the .into25 proportions of to ounds of the powder gallons of t e vehicle. From 3 to 6 gals. of either of the wax emulsions above mentioned is added to 15 to 25' gals. of the borax and shellac solution, the

purpose of the wax being to soften'the hard are brought out.

Preferably the paper used is relatively thin and highly calendered, and the peculiar treatment to w iich it is subjected permits the 'sheen of the paper to be visible to a certain extent through the coating. This fact may be utilized to provide different color effects, the basic paper being tinted for this purpose.

Because of the quality of the paper forming the subject matter of my co-pending application Ser. No. 2440 of even date herewith, it is especially adapted for use in the present rocess. The paper in question is coated with a hard resin, (lac or shellac), a softening agent, (soft gum such as elemi or a suitable oil), and a dry wax, all in alcoholic solution. By a dry wax is meant a wax from which the greatest possible amount of water has been removed, as by expression;

Since these ingredients are applied in alcoholic solution and the metallic powder is added directly to the solution, it is obvious that the redients are dissolved in the alcoholinstea of in'water. The principle however is the same, since alcohol canbe used as the solvent with the borax and shellac in the In the resent rocess the powder is coated with t e vehic e by means of which it is held to the'paper, so that instead of presenting a comparatively rough surface of wder, the aper presents a smooth relatively soft and exible surface of lacquer or varnish. The improved paper has a smoothnes of finish far superior to that prepared by old methods, which is in effect sandpaper. The lacquering of the dust that is the mixing of the same with a transparent or semi-transparent varnish or lacquer permits a degree of light reflection from the polished surface of the paper so that the sheen of the paper body is more or less visible as a sheen by reflected light. gVVith the usual method the dry dust makes an opaque shield or screen through which no light can pass, and all of the color is due to light reflection from the dust itself. j -By suitable coloring of the paper a changeab e silk or iridescent effect may be obtained.

As previously stated argentine requires an additional ingredient, namely an adhesive. The brilliancy of argentinefpaper may however be greatly increased and a better surface obtained by coating the paper with the solution above described.-

I claim: 1. Art paper with a semi-transparent burnished body and a coating ofmetallic powder in a hard flexible transparent fixative including 1110, through which the sheen of the body and the powder are visible.

2. Semi-transparent highly calendered art paper, with a coating of metallic powder in ,a fixative agent of shellac and a waxy substance.

' 3. Art paper with a semitransparent burnished tinted body, and a. coating of metallic powder in a hard transparent fixative including lac, through which coating the sheen of the paper is visible.

4. The process of coating paper, which consists in mixing a metallic powder with a v ehicle composed of water shellac, and a waxy substance, and coating the paper with the vehicle.

5. The process of producing art paper, which consists in applying to a semitransparent burnished paper, a coating of a hard flexible transparent fixative including lac and containing a metallic powder, through which coating visible.

6. The process of coating paper, which consists in applying to the paper a metallic powder in a vehicle composed of shellac 15 to 25pounds, borax 10 to 15 pounds, wax emulsion 3 to 6 gallons, water 15 gallons, and containing 40 to 50 pounds of the metallic wder.

ggned at New York in the county of New York and State of New York this 9th day of January, A. D. 1925.

cnnnannr E. GBIMM.

the sheen of the paper is 

